This Bella + Canvas 3001 Unisex Jersey Short Sleeve Tee is a super soft, lightweight, and 100% combed and ring-spun cotton (30 single 4.2 oz.) champion. They will shrink following the first wash. So, if you're on the fence about your size, it's probably best to go with the larger option and then maybe wash it hot. For more on sizing, check out the full specs and a sizing chart at the Bella + Canvas website. Oh, and it's best to wash your tees inside out in order to extend the life of the printed graphics.